Ship propulsion system having a pump jet

Abstract

The present invention relates to a ship propulsion system (S) having a pump jet (P), which comprises a pump housing (G) and a drive motor, wherein a rotor ( 2 ) of an impeller of the pump jet (P) has a rotational axis (B) which is not aligned with a control axis (A) of the pump jet (P).

1 . Ship propulsion system (S) with a pump jet (P), which contains a pump housing (G) and a drive motor,
 wherein   a rotor ( 2 ) of an impeller of the pump jet (P) contains a rotational axis (B), which is not in alignment with a control axis (A) of the pump jet (P).   
     
     
         2 . Ship propulsion system (S) according to  claim 1 ,
 wherein   the rotational axis (B) of the rotor ( 2 ) is offset with respect to the control axis (A) of the pump jet (P).   
     
     
         3 . Ship propulsion system (S) according to  claim 2 ,
 wherein   the rotational axis (B) of the rotor ( 2 ) and the control axis (A) of the pump jet (P) are parallel.   
     
     
         4 . Ship propulsion system (S) according to  claim 1 , wherein
 the rotational axis (B) of rotor ( 2 ) and the control axis (A) of the pump jet (P) are mutually inclined.   
     
     
         5 . Ship propulsion system (S) according to  claim 4 ,
 wherein   the rotational axis (B) of the rotor ( 2 ) and the control axis (A) of the pump jet (P) intersect at a point.   
     
     
         6 . Ship propulsion system (S) according to  claim 1 , wherein
 the drive motor is an electric motor (E) which is placed on the pump housing (G) or partially integrated therein.   
     
     
         7 . Ship propulsion system (S) according to  claim 6 ,
 wherein   the electric motor (E) is an asynchronous motor, synchronous motor or permanent magnet motor.   
     
     
         8 . Ship propulsion system (S) according to  claim 6   wherein   between the electric motor (E) and the impeller, force transferring parts, such as teeth, roller bearings and/or shafts are provided.   
     
     
         9 . Ship propulsion system (S) according to  claim 1 , wherein
 the drive motor is a magnet motor (M) or a high-temperature superconducting motor integrated in the pump housing (G).   
     
     
         10 . Ship propulsion system (S) according to  claim 9 ,
 wherein   the pump jet (P) can be controlled all around.   
     
     
         11 . Ship propulsion system (S) according to  claim 9   wherein   the magnet motor (M) or high-temperature superconducting motor contains a rotor ( 2 ), which is a component of an impeller (I) of the pump jet (P).   
     
     
         12 . Ship propulsion system (S) according to  claim 9 , wherein
 the magnet motor (M) or high-temperature superconducting motor contains a stator ( 1 ), which is a component of a diffuser inner ring (D) of the pump jet (P).   
     
     
         13 . Ship propulsion system (S) according to  claim 9 , wherein
 the conveyance medium is also used particularly by itself also as lubricant and/or coolant.   
     
     
         14 . Ship propulsion system (S) according to  claim 9 , wherein
 the drive of the pump jet (P) is free of force transferring parts, such as teeth, roller bearings and/or shafts.   
     
     
         15 . Ship propulsion system (S) according to  claim 1 , wherein
 deflection devices ( 12 ,  12   a,    12   b,    12   c,    13 ) are provided, which are arranged and/or designed in an inner space ( 11 ) of the diffuser housing ( 3 ).   
     
     
         16 . Ship propulsion system (S) according to  claim 15 ,
 wherein   the deflection devices ( 12 ,  12   a,    12   b,    12   c,    13 ) are arranged and/or designed in such a way that they eliminate turbulence from a water flow in the inner space ( 11 ) of the diffuser housing ( 3 ) and/or direct the water flow in such a way that water exits through a nozzle ( 9 ) of the pump jet (P) as much as possible without internal turbulence or in such a way that through individual nozzles ( 9   a,    9   b,    9   c ) a desired quantity of water exits per unit of time, particularly the same amount of water per unit of time and/or to the extent possible without internal turbulence, to achieve an optimal thrust effect of the pump jet (P).   
     
     
         17 . Ship propulsion system (S) according to  claim 15   wherein   the deflection devices ( 12 ,  12   a,    12   b,    12   c,    13 ) contain at least one shaping of the inner space ( 11 ) of the diffuser housing ( 3 ).   
     
     
         18 . Ship propulsion system (S) according to  claim 17 ,
 wherein   the deflection devices ( 12 ,  12   a,    12   b,    12   c,    13 ) contain an area ( 12   c ) having a constant cross-sectional profile of the inner space ( 11 ) of the diffuser housing ( 3 ).   
     
     
         19 . Ship propulsion system (S) according to  claim 17 ,
 wherein   the deflection devices ( 12 ,  12   a,    12   b,    12   c,    13 ) contain an area ( 12   a ) having a reduced cross-sectional profile of the inner space ( 11 ) of the diffuser housing ( 3 ).   
     
     
         20 . Ship propulsion system (S) according to  claim 17 , wherein
 the deflection devices ( 12 ,  12   a,    12   b,    12   c,    13 ) contain an area ( 12   a ) having an enlarged cross-sectional profile of the inner space ( 11 ) of the diffuser housing ( 3 ).   
     
     
         21 . Ship propulsion system (S) according to  claim 15 , wherein
 the deflection devices ( 12 ,  12   a,    12   b,    12   c,    13 ) contain at least one guide vane ( 13 ) in the inner space ( 11 ) of the diffuser housing ( 3 ).